Nisus is generally quite good at opening .doc-files written in cyrillic letters, even though they're written on a PC. But... this is true only if the texts are really short. If if they're longer than one page or so, one of two things happens: 1. nothing at all, or 2. Nisus seems to open/convert the document, but then gets stuck in the "typesetting" phase and never comes out of it. The only thing you can do is to force quit the application. Very frustrating.